297mm for TM M3 Shorty
This package has 3 barrels.
Carbon Steel ,
Inner Dia. 6.03mm ,the tolerance is 10 micron class accuracy.
We aim “SMART BARREL will be standard for Airsofts”
Stainless steel series are the best quality,SMART BARREL is better choice.
We process plating for prevention from rust.
If you want lower cost and precision barrel, we recommend SMART BARREL first.